Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quais oponentes têm um parceiro de irina-camelia begu e uma superfície de hard?
 ###Tabelas: CREATE TABLE goals_for_senior_national_team (goals_for_senior_national_team_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Venue VARCHAR, Score VARCHAR, Result VARCHAR, Competition VARCHAR) CREATE TABLE aircraft (aircraft_id AUTO_INCREMENT PRIMARY KEY, Category VARCHAR, Speed (km/h) INT, Speed (mph) INT, Vehicle VARCHAR, Pilot VARCHAR, Date VARCHAR) CREATE TABLE doubles:_10_2_titles_8_runners-up (doubles:_10_2_titles_8_runners-up_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents VARCHAR, Score VARCHAR) CREATE TABLE 21st_century (21st_century_id AUTO_INCREMENT PRIMARY KEY, Year INT, Men's singles VARCHAR, Women's singles VARCHAR, Men's doubles VARCHAR, Women's doubles VARCHAR, Mixed doubles VARCHAR) CREATE TABLE "_"___32_nm_dual-core ("_"___32_nm_dual-core_id AUTO_INCREMENT PRIMARY KEY, Model number VARCHAR, sSpec number VARCHAR, Frequency VARCHAR, Turbo VARCHAR, GPU frequency VARCHAR, Cores INT, L2 cache VARCHAR, L3 cache VARCHAR, I/O bus VARCHAR, Mult. VARCHAR, Memory VARCHAR, Voltage VARCHAR, TDP VARCHAR, Socket VARCHAR, Release date VARCHAR, Part number(s) VARCHAR, Release price ( USD ) VARCHAR)  
SELECT Opponents FROM doubles:_10_2_titles_8_runners-up WHERE Partner = irina-camelia begu AND Surface = hard